Recently throughout the world, the world, the importance of plastics pipes in the design associated with wholesale PEX pipe system for public not to mention industrial water supply and sewage transport has gradually increased. This trend reflects a growing confidence in plastics as a piping material, perhaps due mainly to greater worldwide knowledge and also experience in this field.

The plastics are mostly manufactured on a petrochemical basis with petroleum as the raw material. In this context it may well be of interest to know how the world consumption related with petroleum looks. Only 4% around the world production concerning oil used for manufacturing plastics while 96% is burned as fuel in the fields for transportation, heating, etc.

The use associated with plastics is expanding rapidly, and additionally especially in the case regarding plastics pipes. This is in particular true for pipes designed for water pipes and sewers outdoors not to mention indoors. All industrial nations show the same tendency. As an example, it can be mentioned that PE hdpe pipe production in Europe rose from about 1.4 million tonnes in 1985 to 2.6 million tonnes in 1997. The corresponding figures for USA were 1.8 million tonnes in 1986 together with 2.4 million tones in1997. Plastics pipe market Europe The Further annual growth in Europe for pipes is estimated at 7% for PE, 10% for PP not to mention 2% for PVC.

The favorable price trend has also contributed to the fact that today plastics pipes are competitive with conventional pipes within the total civil engineering infrastructure branch.

Against the background connected with such developments, it appears suitable to spread further knowledge of plastics pipes coupled with hoe they should certainly be used in a proper way for water supply together with sewage disposal. For this reason, the previous survey of the problems, in particular in the field of outdoor pipe applications , is hereby updated.

Cross linked polyethylene can be based upon high quality hdpe pipe as well as (M D P E). In the cross linking process the molecules are linked together by robust chemical bonds together with chemical physical cross linking approaches are both available. The chemical approaches implies use about cross linking agents such as peroxide, (A Z O) compounds, while physical cross linking is archived by electron radiation.